It's just to let the slower cars know you're coming to lap them, so they can pull over! (consider it the blue flag of RC racing)
In all seriousness, I'd slacken off all the screws retaining the motor mount and rear spur gear mount, then slacken the screw clamping the two together, then gradually and evenly tighten them back up, leaving the slipper assembly in place. That may help.
Also try adjusting the shims on the slipper assy.
The noise just resonates through the chassis, sounding worse than it is.
If the above doesn't help, I honestly wouldn't worry too much.. But I know the noise you mean..
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